JP4576655B2 - COMPOSITE PRESSURE CONTAINER AND MANUFACTURING METHOD THEREOF - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a lightweight pressure vessel and the like used for space accumulators and the manufacturing method thereof, and more particularly, to a composite material pressure vessel expressing a high breaking pressure and a manufacturing method thereof.
[0002]
[Prior art]
As a pressure vessel for accumulating gas, generally made of steel is widely used, and a fire extinguisher, a nitrogen gas vessel, a propane gas vessel and the like are widely known. However, steel containers are heavy and are not applicable for some applications. For example, a composite pressure vessel using FRP as a reinforcing material is often used for space accumulators and aircraft applications that are particularly required to be lightweight. In addition, a lightweight composite pressure vessel is applied to a natural gas vessel (NGV) that has been attracting attention in recent years in terms of environmental protection for consumer use, for example.
[0003]
Pressure vessels of this type are generally non-metal are produced (mainly resin) or a method providing an FRP layer on the metal in Nara Ina, also optionally in a manner such as to wet filament winding.
[0004]
That is, for example, on the thin film hollow Titanium liner (inner case), full of glass fiber toe or carbon fiber-to-impregnated with the epoxy resin composition Iramento (reinforcing fibers) the hoop winding, continuously by helical winding, etc. Filament winding is performed by tightly winding the wire.
[0005]
After that, the composite material pressure vessel reinforced with fibers is completed by solidifying each part by heating the whole for a predetermined time to cure and cool. Of course, a structure in which only a FRP layer is provided without adopting filament winding is also used for those having low required strength.
[0006]
By the way, in the composite material pressure vessel, there is an example in which the pressure vessel breaks before the fracture strain possessed by the composite material. In the case of a pressure vessel that was broken at a pressure lower than the expected value as a result of stress analysis, the specimen after the pressure fracture was observed in detail, and if there was a gap between the metal liner and the composite material layer, It was estimated that slipping occurred.
[0007]
However, in the conventional methods as described above, there is a limitation that the resin is in a liquid state at room temperature, and there is a problem that the mechanical properties of the composite material cannot be improved. In particular, a structure using a tow prepreg that exhibits high mechanical properties has a defect that a “gap” and “slip” are generated between the inner container liner and the composite material layer, and the original high breaking pressure cannot be expressed. .
[0008]
[Problems to be solved by the invention]
The present invention was devised by paying attention to such problems of the prior art, and is a lightweight composite pressure vessel that maximizes the effect of the composite layer for reinforcement and exhibits high fracture pressure performance. It is intended to provide.
[0009]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention is to provide a composite pressure vessel having the following configuration and a method for manufacturing the same.
The present invention has a metal inner liner and an FRP layer on the outer side of the inner liner. In order to suppress the occurrence of “gap” and “slip” between the metal inner liner and the FRP layer, the inner liner and the FRP layer adhesion excellent and elongation of the large thermoplastic resin layer der riff phenoxy resin between, the composite pressure vessel a resin layer interposed therebetween comprising a resin selected from the group consisting of urethane-modified epoxy resins and nylon modified epoxy resin is there.
The present invention also includes a metal inner liner and an FRP layer on the outer side of the inner liner, and the inner liner and the FRP layer are controlled to suppress the occurrence of “gap” and “slip” between the metal inner liner and the FRP layer. filament winding the adhesive excellent and elongation of the large thermoplastic resin layer der riffs phenoxy resin, by interposing a resin layer made of a resin selected from the group consisting of urethane-modified epoxy resins and nylon modified epoxy resin towpregs between There is also a composite pressure vessel.
The present invention further includes a metal inner liner and an FRP layer on the outer side of the inner liner, and the inner liner and the FRP layer are formed to suppress occurrence of “gap” and “slip” between the metal inner liner and the FRP layer. composite pressure vessel to interpose larger thermoplastic resin layer der riff phenoxy resin excellent and stretch adhesion, a resin layer composed of a resin selected from the group consisting of urethane-modified epoxy resins and nylon modified epoxy resin between the There is also a manufacturing method.
[0010]
Thus, by interposing a thermoplastic resin having high adhesion and elongation between the metal container liner and the composite material layer, a lightweight pressure container that exhibits a high breaking pressure can be provided.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
The specimen after pressure fracture was observed in detail, and as a result of stress analysis, in a composite pressure vessel that was broken at low pressure, if a gap was generated between the metal liner and the composite layer, slipping occurred between the layers. As a result, it was estimated that the pressure vessel would break before the fracture strain of the composite material.
[0012]
From the verification of the specimen after the pressure fracture, it is known that when a gap is generated between the liner and the composite material layer, a slip is generated between the layers and the strength is reduced. It was confirmed that interposing a resin having excellent adhesiveness and large elongation between the layers was a solution, and as a result of applying the phenoxy resin blended in the toubreg, it was confirmed that a predetermined result was obtained.
[0013]
Therefore, in the present invention, in order to achieve the above object, a thermoplastic resin having high adhesiveness and elongation is interposed between the container liner and the composite material layer. As a result, a lightweight pressure vessel that exhibits high breaking pressure by suppressing gaps and slippage between layers generated when a pressure load is applied can be obtained.
[0014]
Examples of a resin suitable for application to the present invention include phenoxy resin, rubber-modified epoxy resin, urethane-modified epoxy resin, and nylon-modified epoxy resin. Other than this, a similar effect can be obtained as long as the resin is interposed between the metal liner and the composite material and has excellent adhesion and elongation.
[0015]
The inner liner may be other than a metal liner, and can be applied to a non-metal liner in the same way. A composite pressure vessel having a structure in which a phenoxy resin is interposed between a metal liner and a composite material layer can provide sufficient strength.
[0016]
In order to manufacture the container as described above, for example, a thin-film hollow titanium liner (inner layer container) is prepared, and the resin layer is applied on the liner and further impregnated with an epoxy resin composition. Alternatively, FRP layers such as carbon fiber tows are densely laminated.
[0017]
After that, the composite material pressure vessel reinforced with fibers is completed by solidifying each part by heating the whole for a predetermined time to cure and cool. Of course, filament winding may be performed for those requiring higher strength.
[0018]
In this case, prepared for example thin hollow Titanium liner (inner case), thereon, coating the resin layer, further off such as glass fiber toe or carbon fiber-to-impregnated with the epoxy resin composition Filament winding is performed by continuously and densely winding filaments (reinforcing fibers) by hoop winding, helical winding or the like.
[0019]
After that, as described above, the whole is heated in an oven for a predetermined time and cooled to obtain a composite pressure vessel.
[0020]
As described above, the present invention provides a composite material pressure vessel in which a phenoxy resin or other resin is interposed between a metal liner or a non-metallic liner and a composite material layer. The gist of this is to prevent the above and increase the breakdown pressure.
[0021]
The present invention can be used not only for special purposes such as space use but also for consumer use such as NGV. Moreover, it is also possible to apply to a container having a larger structure.
[0022]
[Experimental example] As a result of applying a phenoxy resin blended in toe prep as a resin having excellent adhesion and large elongation interposed between the aforementioned layers of the composite pressure vessel, a predetermined strength result was obtained. .
[0023]
Example 1 A phenoxy resin / MEK solution is applied on a titanium liner and dried. On top of that, carbon fiber toe (T800H Toray) impregnated with an epoxy resin composition is filament wound. Thereafter, the composite pressure vessel of the example was obtained by heating and curing in an oven at 180 ° C. for 3 hours (Sample A).
[0024]
Comparative Example 1: A composite pressure vessel of a comparative example was obtained by removing the step of applying the phenoxy resin / MEK solution from the above production method (Sample B).
[0025]
[Result characteristics]
For specimen A, a breaking pressure of 439 (kgf / cm ^ 2) was obtained.
Specimen B had a breaking pressure of 370 (kgf / cm ^ 2).
[0026]
【The invention's effect】
As described above, according to the method of the present invention, it is possible to provide a composite pressure vessel that is lightweight and exhibits a destructive pressure for industrial or consumer use.

Claims (3)

A metal inner liner and an FRP layer on the outer side of the inner liner, and adhesion between the inner liner and the FRP layer in order to suppress the occurrence of “gap” and “slip” between the metal inner liner and the FRP layer . and large thermoplastic resin layer der elongation excellent riff phenoxy resins, urethane-modified epoxy resin and composite pressure vessel the resin layer is interposed made of a resin selected from the group consisting of nylon-modified epoxy resin. A metal inner liner and an FRP layer on the outer side of the inner liner, and adhesion between the inner liner and the FRP layer in order to suppress the occurrence of “gap” and “slip” between the metal inner liner and the FRP layer . excellent and large thermoplastic resin layer der riff phenoxy resin elongation, urethane-modified epoxy resin and composite pressure vessel to filament winding by towpreg with a resin layer interposed therebetween comprising a resin selected from the group consisting of nylon-modified epoxy resin . A metal inner liner and an FRP layer on the outer side of the inner liner, and adhesion between the inner liner and the FRP layer in order to suppress the occurrence of “gap” and “slip” between the metal inner liner and the FRP layer . excellent and large thermoplastic resin layer der riff phenoxy resin elongation method of producing a composite material pressure vessel to interpose a resin layer made of a resin selected from the group consisting of urethane-modified epoxy resins and nylon modified epoxy resin.